Adaptive quantizer with instantaneous error robustness

Details Adaptive quantizer with instantaneous error robustness Adaptive quantizer with instantaneous error robustness

1982-04-30

1984-09-04

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

358135, 332 11D, H03K 1322

Patent

active

044701462

ABSTRACT:
A robust ADPCM encoder with a modified leaky quantizer and a pair of parallel predictors is provided. A large leakage is initially inserted into the quantization scale adaptation by utilizing a number of most recent multipliers in a modified leaky Jayant quantizer. Using a dual predictor feedback loop, inside predictor coefficients are updated by the step size having unit variance instead of by the quantized prediction error.

REFERENCES:
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patent: 4075655 (1978-02-01), Iijima et al.
patent: 4109203 (1978-08-01), Eggermont et al.
patent: 4179710 (1979-12-01), Ishiguro et al.
patent: 4184049 (1980-01-01), Crochiere et al.
patent: 4255763 (1981-03-01), Maxemchuk et al.
patent: 4317208 (1982-02-01), Araseki et al.
patent: 4319360 (1982-03-01), Cointot
Jones and West "Adaptive Delta Modulator with Variable Sample Rate" IBM Technical Disclosure Bulletin vol. 15, No. 10, Mar. 1973.

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